code: def _npSoftplus(self, np_features):
      np_features = np.asarray(np_features)
      zero = np.asarray(0).astype(np_features.dtype)
      return np.logaddexp(zero, np_features)
  
file_path: tensorflow-upstream/tensorflow/python/kernel_tests/nn_ops/softplus_op_test.py
imports: import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import gradient_checker
  from tensorflow.python.ops import gradients_impl
  from tensorflow.python.ops import nn_ops
  import tensorflow.python.ops.nn_grad
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the SoftplusTest obj's underlying member method code with example usage: obj._npSoftplus(np_features) and returns: np